What is the smallest species of thumbnail?

[Frogopolis]

If there are other species outside of this genus you can list them too. The one problem I can remember of the tiny species is that they are hard to come by and are expensive.

I'm kind of looking for a challenge. It's the reason I've been cutting back on my collection in the last year. I decided not to buy any new frogs until I can find a more difficult species to work with.

[Philsuma]

Ranitomeya reticulata gets my vote.

About $80-100 for a well started froglet

Uncommon but not rare in the U.S hobby. At least two different 'morphs' or populations / imports

The males are VERY combative. Deaths and stress are much higher than most other thumbnails

The froglets morph out tiny. TINY and need lots of extra care and feedings / supplements.

[Frogopolis]

Ranitomeya reticulata gets my vote.

About $80-100 for a well started froglet

Uncommon but not rare in the U.S hobby. At least two different 'morphs' or populations / imports

The males are VERY combative. Deaths and stress are much higher than most other thumbnails

The froglets morph out tiny. TINY and need lots of extra care and feedings / supplements.

I completely forgot about Reticulata. I almost bought some about a year ago. I'll go back and start researching them again.

Thanks,